Parasound
Parasound Halo A51 5 Channel Power Amplifier
Parasound Halo A51 5 Channel Power Amplifier
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Description
Parasound's HALO A51 5 Channel Power Amplifier gives you the optimal amount of performance that only most really high end systems achieve, again nailing Parasound’s colours to the mast when it comes to that getting the maximum ‘bang for your buck’. Add this thoroughbred THX Ultra2 certified, high bias Class A/AB amplifier to your home theater and watch or listen to everything transform. This five‑channel amp effortlessly boosts your AVR, powering your front and surrounds with clean, room-filling performance that punches well above its price. Designed by John Curl, the A51 runs high‑bias Class A/AB in a direct‑coupled topology for maximum clarity. It delivers 250 W x5 into 8 Ω (400 W x5 into 4 Ω) with THX Ultra2 certification, fed by a 2.2 kVA toroidal transformer and 164,000 µF of filter capacitance for clean current on demand. Balanced XLR and RCA inputs make it a drop‑in upgrade for any AVR/processor with pre‑outs. Circuitry designed by legendary John Curl, THX Ultra2 certified, High bias Class A/AB operation, Balanced inputs with discrete circuits and XLR connectors, Direct Coupled – no capacitors or inductors in signal path.
Complementary MOSFET driver stage and JFET input stage, 40 beta-matched 15 amp, 60 MHz bipolar output transistors, 2.2 kVA encapsulated toroid power transformer with independent secondary windings for each channel, 164,000 μF power supply filter capacitance, DC Servo and relay protection circuits, AC present, channel status, high temperature indicators, Heavy-duty 24k gold-plated 5-way speaker terminals.
Features & Specifications:
- Circuitry designed by legendary John Curl
- THX Ultra2 certified
- High bias Class A/AB operation
- Balanced inputs with discrete circuits and XLR connectors
- Direct Coupled – no capacitors or inductors in signal path
- Complementary MOSFET driver stage and JFET input stage
- 40 beta-matched 15 amp, 60 MHz bipolar output transistors
- 2.2 kVA encapsulated toroid power transformer with independent secondary windings for each channel
- 164,000 μF power supply filter capacitance
- DC Servo and relay protection circuits
- AC present, channel status, high temperature indicators
- Heavy-duty 24k gold-plated 5-way speaker terminals
- Gold-plated RCA input jacks; ground lift switch
- Auto turn-on by 12v trigger or audio signal
Specifications:
- Continuous power output:250 watts RMS x 5, 20 Hz – 20 kHz, 8 Ω, all channels driven400 watts RMS x 5, 20 Hz – 20 kHz, 4 Ω, all channels driven
- Current capacity: 60 amperes peak per channel
- Power bandwidth: 5 Hz – 100 kHz, +0/-3 dB at 1 watt
- Total harmonic distortion: < 0.2 % at full power
- IM distortion: balanced 16 V rms < 0.04 %
- Slew rate: > 130 V/µsecond
- Dynamic headroom: > 1.5 dB
- Interchannel crosstalk: > 78 dB at 1 kHz; > 63 dB at 20 kHz
- Input sensitivity: 1 V for 28.28 V, THX Reference Lev
- Input impedance: 47 k Ω unbalanced; 94 k Ω balanced
- S/N ratio: 112 dB, input shorted, IHF A-weighted
- Damping factor: > 1100 at 20 Hz
- Voltage: 110V – 120V
- Dimensions: 17-1/2″ w x 7-5/8″ h x 20″ d, 7″ h without feet
- Net weight: 80 lb.
